Can someone get me the answers for the paper attached

Which approach to the theory-and-research cycle does the following sequence reflect: (1) specific observations suggest generalizations, (2) generalizations produce a tentative theory, (3) the theory is tested through the formation of hypotheses, and (4) hypotheses may provide suggestions for additional observations?

Which of the following is most likely the next step in the series? a3z, b6y, c9x, d12w, е15v, f18u

10% of 1,900,000. show me how you got the answer